Rotate_left and Rotate_right functions for a treap
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Thread: Rotate_left and Rotate_right functions for a treap

  1. #1
    Join Date
    May 2013
    Posts
    1

    Question Rotate_left and Rotate_right functions for a treap

    Hi I have the following code for a treap but I don't know how to make roate_left and rotate_right functions to balance it. I need some explanations and some code. Thanks

    Code:
    #include<iostream>
    #include<utility>
    #include<stdlib.h>
    #include<time.h>
    #include<stdio.h>
    using namespace std;
    template<typename T> class Treap{
        public:
            unsigned int priority;
            Treap<T> *root, *left, *right, *parent;
            T *pinfo;
            
    
            Treap()
            {
                priority = rand();
                left = right = NULL;
                root = this;
                pinfo = NULL;
            }
    
            void insert(T x)
            {
                 if (pinfo == NULL)
                {
                    pinfo = new T;
                    *pinfo = x;
                }
                else
                {
                    if (x<=*pinfo){
                        if (left == NULL){
                            left = new Treap<T>;
                            left->pinfo = new T;
                            *(left->pinfo) = x;
                            //balance(left);
                            left->left = left->right = NULL;
                            left->parent = this;
                            left->root = root;
                        }
                    else
                        left->insert(x);
                    }
                    else{
                        if (right == NULL)
                        {
                            right = new Treap<T>;
                            right->pinfo = new T;
                            *(right->pinfo) = x;
                            //balance(right);
                            right->left = right->right = NULL;
                            right->parent = this;
                            right->root = root;
                        }
                        else
                            right->insert(x);
                    }
                }
            }
    
            Treap<T>* find(T x)
            {
                Treap<T> *rez;
    
                if (pinfo == NULL)
                    return NULL;
    
                if ((*pinfo) == x)
                    return this;
    
                if (x <= (*pinfo))
                {
                    if (left != NULL)
                        return left->find(x);
                    else
                        return NULL;
                }
                else
                {
                    if (right != NULL)
                        return right->find(x);
                    else
                        return NULL;
                }
            }
    
            void inOrderTraversal()
            {
                if (left != NULL)
                    left->inOrderTraversal();
    
                //std::cout<<pinfo->first<<" "<<pinfo->second<<std::endl;
                cout<<*pinfo<<" ";
                if (right != NULL)
                    right->inOrderTraversal();
            }
    };
    
    int main()
    {
        srand(23424);
        Treap<int> *r = new Treap<int>;
        r->insert(2);
        r->insert(5);
        r->insert(7);
        r->insert(1);
        r->insert(9);
        r->inOrderTraversal();
        return 0;
    }

  2. #2
    2kaud's Avatar
    2kaud is offline Super Moderator Power Poster
    Join Date
    Dec 2012
    Location
    England
    Posts
    5,883

    Re: Rotate_left and Rotate_right functions for a treap

    All advice is offered in good faith only. All my code is tested (unless stated explicitly otherwise) with the latest version of Microsoft Visual Studio (using the supported features of the latest standard) and is offered as examples only - not as production quality. I cannot offer advice regarding any other c/c++ compiler/IDE or incompatibilities with VS. You are ultimately responsible for the effects of your programs and the integrity of the machines they run on. Anything I post, code snippets, advice, etc is licensed as Public Domain https://creativecommons.org/publicdomain/zero/1.0/ and can be used without reference or acknowledgement. Also note that I only provide advice and guidance via the forums - and not via private messages!

    C++17 Compiler: Microsoft VS2017 (15.5.1)

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